Piperidine-spiro-hydantoin derivatives and their use as stabilizers

ABSTRACT

New piperidine-spiro-hydantoin derivatives represented by the formula   WHEREIN R represents an alkyl group, an alkenyl group, an alkenoyl group which may be substituted with an aryl group, a hydroxyalkyl group, an alkoxyalkyl group, an alkoxycarbonylalkyl group, an acyloxyalkyl group, a cyanoalkyl group or nitroso group, and X and Y individually represent oxygen atom or sulfur atom. They are useful as stabilizers against photo- and thermaldeterioration of various synthetic polymers.

United States Patent 1191 Murayama et a]. 1

[451 Aug. 5, 1975 [73] Assignee: Sankyo Co., Ltd., Tokyo, Japan [22] Filed: May 10, 1973 [21] Appl. No.: 358,966

[30] Foreign Application Priority Data June 3, 1972 Japan 47-55263 May 31, 1972 Japan 47-54061 [52] U.S. Cl. 260/880 R; 260/25 BB; 260/458 NT; 260/775 SS; 260/864 [51] Int. Cl. C08f 45/60; C08g 51/60 [58] Field of Search 260/458 N, 45.8 NT, 864, 260/880 [56] References Cited UNITED STATES PATENTS 2,684,965 7/1954 Weston et alum. 260/293.87 3,126,393 3/1964 Young 260/293.87 3,474,068 10/1969 Murayama et al.... 260/458 3,542,729 11/1970 Murayama et al.... 260/458 3,547,874 12/1970 Murayama et al 260/458 3,705,126 12/1972 Matsui et al. 260/458 3.705.166 12/1972 Murayama et al. 260/293.86 3.759.926 9/1973 Chalmers et al 260/2939 Primary Etaminer-Donald E. Czaja Assistanl ExzmzinerR. A. White Attorney, Agent, or Firm-Toren, McGeady and Stanger [57] ABSTRACT New piperidine-spiro-hydantoin derivatives sented by the formula reprewherein R represents an alkyl group, an alkenyl group, an alkenoyl group which may be substituted with an aryl group, a hydroxyalkyl group, an alkoxyalkyl group, an alkoxycarbonylalkyl group, an acyloxyalkyl group, a cyanoalkyl group or nitroso group, and X and Y individually represent oxygen atom or sulfur atom. They are useful as stabilizers against photoand thermal-deterioration of various synthetic polymers.

9 Claims, No Drawings 1 PIPERIDINE-SPIRO-I-IYDANTOIN DERIVATIVES AND THEIR USE AS STABILIZERS This invention relates to a new class of piperidinespiro-hydantoin derivatives and their use as stabilizers.

More particularly, this invention is concerned with a piperidine-spiro-hydantoin derivative having the formula x HN r Y NH (I) CH3 CH wherein R represents an alkyl group, an alkenyl group, an alkenoyl group which may be substituted with an aryl group, a hydroxyalkyl group, an alkoxyalkyl group, an alkoxycarbonylalkyl group, an acyloxyalkyl group, a cyanoalkyl group of nitroso group, and X and Y individually represent oxygen atom or sulfur atom. Also, it is concerned with a synthetic polymer composition stabilized against photoand thermal-deterioration by having incorporated therein at least one of the piperidine-spirohydantoin derivatives (I) in a sufficient amount to prevent the above deterioration.

The term synthetic polymer as used herein is contemplated to include: olefin, diene and styrene polymers including homopolymers of olefins, dienes and styrene (e.g. low and high density polyethylenes, polypropylene, polystyrene, polybutadiene and polyisoprene), and copolymers of olefins, dienes and styrene with each other or with other ethylenicallyunsaturated monomers (e.g. ethylene-propylene copolymers, ethylene-butene copolymers, ethylene-vinyl acetate copolymers, styrene-butadiene copolymers and acrylonitrile-butadiene-styrene copolymers);

vinyl chloride and vinylidene chloride polymers including homopolymers of vinyl chloride and vinylidene chloride, vinyl chloride-vinylidene chloride copolymers, and copolymers of vinyl chloride or vinylidene chloride with vinyl acetate or other ethylenically-unsaturated monomers;

polyacetals e.g. polyoxymethylene and polyoxyethylene; polyesters e.g. polyethylene terephthalate; polyamides e.g. nylon-6, nylon-6,6 and nylon-6,10; and polyurethanes.

In the above formula (I), the alkyl group may be preferably of l to 8 carbon atoms, for example, methyl, ethyl, n-propyl, n-butyl, isobutyl, pentyl, hexyl, heptyl or octyl; the alkenyl group may be preferably of 3 to 4 carbon atoms, for example, allyl or trans-2-butenyl; the alkenoyl group optionally substituted with the aryl group may be preferably of 3 to 4 carbon atoms in the alkenoyl moiety and of 6 to 10 carbon atoms in the aryl moiety, for example, acryloyl, crotonoyl or cinnamoyl; the hydroxyalkyl group may be preferably of l to 4 carbon atoms, for example, hydroxymethyl, 2- hydroxyethyl, ,3-hydroxypropyl or 4-hydroxybutyl; the alkoxyalkyl group may be preferably of l to 8 carbon atoms in each of the alkoxy and alkyl moieties, for example, Z-methoxyethyl, ethoxymethyl, Z-ethoxyethyl, 4-propoxybutyl or 2-octoxyethyl; the acyloxyalkyl group may be preferably of l to 4 carbon atoms in the alkyl moiety and of a saturated or unsaturated aliphatic or aromatic acyl moiety, for example, 2-acetoxyethyl, 2-propionyloxyethyl, 3-butylryloxypropyl, benzoyloxymethyl, 2-benzoyloxyethyl, 2-acryloyloxyethyl or 2 -methacryloyloxyethyl; the alkoxycarbonylalkyl group may be preferably of l to 4 carbon atoms in the alkyl moiety and of l to 18 carbon atoms in the alkoxy moiety, for example, methoxycarbonylmethyl, ethoxycarbonylmethyl, 2 -butoxycarbonylethyl, octoxycarbonylmethyl or stcaryloxycarbonylmethyl; the cyanoalkyl group maybe preferably of l to 4 carbon atoms, for example, cyanomethyl, 2-cyanoethyl, 3- cyanopropyl or 4-cyanobutyl,

Synthetic polymers have been widely utilized in the art, in view of their excellent properties, in various forms or shapes, for example, filament, fibre, yarn, film, sheet, other molded article, latex and foam. However, these polymers have some drawbacks such as poor lightand heat-stabilities and the like. Stated illustratively, polyolefins and polyurethane elastomers fre quently tend to undergo severe deterioration when exposed to light such as sunlight or ultraviolet ray, and polyvinyl chloride and polyvinylidene chloride frequently tend to deteriorate and become colored by the action of light and heat together with elimination of hydrogen chloride therefrom. Polyamides are also frequently subjected to photo-deterioration. For the purpose of stabilizing these synthetic polymers against such deterioration, there have heretofore been pro-- posed in the art a number of stabilizers; for example, for polyolefins, benzotriazole compounds and benzophenone compounds; for polyurethanes, phenol compounds and benzophenone compounds; and for polyvinyl chloride and polyvinylidene chloride, lead salts such as basic lead silicate and tribasic lead maleate, and organotin compounds such as dibutyltin laurate and dibutyltin maleate.

Although such prior stabilizers are believed to be considerably satisfactory, some problems to be improved still remain.

Thus, numerous attempts have been made in the art to fild and develop new and more effective stabilizers.

As a result of our extensive studies to find a new type of stabilizers, it has been found that the piperidinespiro-hydantoin derivatives of the formula (1) exhibit a high stabilizing effect against photoand thermaldeterioration of the synthetic polymers.

It is accordingly an object of this invention to provide a new class of the piperidine-spiro-hydantoin derivatives (I) having practical utility as stabilizers for the synthetic polymers.

Another object of this invention is to provide a synthetic polymer composition stabilized against the deterioration thereof by having incorporated therein, in a sufficient amount to prevent such deterioration, at least one of the piperidine-spiro-hydantoin derivatives (I).

Other objects of this invention will become apparent from the following description.

3 In one aspect of this invention, there is provided a new group of the piperidine-spiro-hydantoin derivatives (I).

Of the piperidine-spiro-hydant0in derivatives (I), a preferable class can be represented by the following formula:

wherein R is an alkyl group of l to 8 carbon atoms, an alkenyl group of 3 to 4 carbon atoms, an alkenoyl group of 3 to 4 carbon atoms, an alkoxyalkyl group of l to 8 carbon atoms in each of the alkoxy and alkyl moieties, an alkoxycarbonylalkyl group of 1 to 4 carbon atoms in the alkyl moiety and 1 to 18 carbon atoms in the alkoxy moiety, an acyloxyalkyl group of l to 4 carbon atoms in the alkyl moiety and of an unsaturated or saturated aliphatic or aromatic acyl moiety and a cyanoalkyl group of 1 to 4 carbon atoms and X and Y each represent oxygen atom.

Representative examples of the piperidine-spirohydantoin derivatives of the formula (I) which may be advantageously employed in this invention are listed below.

Compound No. Chemical Name 1 1.3 ,8-triaza-7,7,8,9,9 pcntamelhyl-spirol 4.5 l-

decune-2,4-dione 1.3 .8-triaza-7,7,8 9,9-pentumethyl-spiro[ 4.5

decane-2.4-dithionc Continued Compound I I v No. Chemical Name In view of a stabilizing effect, those compounds having the above Compound Nos. l,3,4,5,8,l0,l2 and 14 are preferable and, most preferably, may be utilized those compounds having the above Compound Nos. 1,4,8, and 14 as stabilizers for synthetic polymers.

The piperidine-spirohydantoin derivatives (I) of this invention are all new compounds as stated. above and can be easily prepared by various methods, some of which will be illustratively described below:

In the above formulae, R represents an alkyl group, a hydroxyalkyl group, an acyloxyalkyl group or an alkoxycarbonylalkyl group. a

The compounds (I-l) may be prepared by reacting the starting compounds (III) with an alkali cyanide and ammonium carbonate.

In the above formulae, R represents an alkyl group,

The amount of the compound or compounds of fora hydroxyalkyl group, an acyloxyalkyl group or an alk- 5 mula (I) needed for effective stabilization of the synoxycarbonylalkyl group.

The compounds (I-2) may be prepared by reacting the starting compounds (III) with potassium cyanide and ammonium chloride to produce the intermediate thetic polymer will depend on a variety of factors, such as the type and properties of the polymer concerned, its intended use, and the presence, of other stabilizers. It is generally satisfactory to use from 0.01 to 5.0% by (IV) and then reacting the latter product thus obtained 10 weight of the compounds of formula (I), based on the with carbon disulfide and sulfur.

x HN -f Y NH CH CH on N CH3 weight of the synthetic polymer, but the most effective In the above formulae, R represents an alkoxyalkyl range will vary with the type of polymer viz. 0.01 to group, an alkenoyl group which may be substituted with an aryl group or nitroso group, X is a halogen atom and X and Y are as defined above.

The compounds (I-3) may be prepared by reacting 2.0%, preferably 0.02 to 1.0%, by weight for olefin, diene and styrene polymers; 0.01 to 1.0%, preferably 0.02 to 0.5%, by weight for vinyl chloride and vinylidene chloride polymers; and 0.01 to 5.0%, preferably the starting compounds (V) with a halide in the pres- 0.02 to 2.0%, by weight for polyurethanes and polyamence of a base.

ides. If desired, two or more of the compounds of the In the above formulae, X and Y are as defined above. invention ay be us d together.

The compounds (1-4) may be prepared by reacting the starting compounds (IV) with acrylonitrile.

l-lCHO NH l-ICOOH The stabilizers of the invention may readily be incorporated into the synthetic polymers by conventional x HN CF CH3 3 u CH3 ,1, 0.

techniques, at any convenient stage prior to the manufacture of shaped articles therefrom. For example, the stabilizer may be mixed with the synthetic polymer in 1 dry powder form, or a suspension or emulsion of the n another aspect of this invention, there is pro stabilizer may be mixed with a solution, suspension or a synthetic polymer composition stabilized against photoand thermal-deterioration thereof wherein there is incorporated, in a sufficient amount to prevent such deterioration, at least one of the piperidine-spirohydantoin derivatives(l).

emulsion of the synthetic polymer.

The stabilized synthetic polymer compositions of the invention may also contain various conventional additives, such as antioxidants, ultraviolet absorbers, fillers methylphenol),

and Ni". if such conventional stabilizers are employed, it is preferred to use them in a weight ratio of O.53:1 with respect to the stabilizers of the invention.

and pigments. The following are examples of antioxidants which may be used: phenolic compounds, such as 2,6-di'-t-butyl-p-cresol, 4,4 -thiobis( 6-t-butyl-3- methylphenol), 2,2-thiobis(6-t-butyl-4- 4,4'-bis(2,6-di-t-butylpheno1), 4,4-

2,4,6-triisopropylphenol,

bis(2,6-diisopropylphenol), 4,4 -buty1idene-bis( 6-t-butyl-3 -methy1pheno1),

tris(-t-butyl-4-hydroxy-2-methylphenyl)butane, tetra- Z This invention will be more fully illustrated by the following examples.

Examples 1 to 7 describe the preparation of the piperidine-spiro-hydantoin derivatives (1) of this invention.

Examples 8 to 16 describe the synthetic polymer compositions stabilized against their photoand thermal-deterioration by having incorporated therein the piperidine-spiro-hydantoin derivatives (1) as well as their stabilizing effects.

EXAMPLE 1 1,3,8-Triaza-7,7,9,9-tetramethyl-8-octyl-spiro[4.5

decane-2,4-dione To a solution of3 g. of sodium cyanide and 16 g. of

. ammonium carbonate in 40 ml. of aqueous etha- IR spectrum (Nujol mull): v 3340; 3150 cm,

EXAMPLE 2 To a.solution of 4 g. of sodium cyanide and 22g. of

- prepared. 1

ammonium carbonate in 50 ml. of 50 aqueous ethanol'was'added 5g. of 1-ethoxycarbonylmethyl-2,2,6,6- tetramethyl-4-oxopiperidirie andthe resulting mixture was stirred at room temperature for 20 minutes and subsequently at 45Y5 OC, for 3 hours. I

. Then, the reaction mixture was concentratedand the crystalline residue "was washed with wate'r a'nd then dried. Recrystallization froiri 20f aqueous ethanol gave the desired productas'white crystals melting at l93194C.

Analysis for C, H N O Calculated: C,57.86%; H,8.09%; N,13.50%.

Found: c,57.90%; H,8.09%; N,1 3.66%.

IR spectrum (Nujol mull):v- 3350; 3180 cm, 11 1778; 1752; 1710 cm.

Substantially following the same procedure as set forth above, those compounds indicatedrbelow were 8-ally1-l,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]- decane-2,4-dione, dione, m.p. 24l.5-243C. l ,3 ,8-triaza-8-( 2-hydroxyethyl )-7 ,7 ,9,9-tetramethyl- I spiro[4.5]decane-2,4-dione; m'p. 225C. (withdecomposition) 8-( 2-acetoxyethyl )-:1 ,3 ,8-t riaza-7 ,7 ,9 ,9-tetramethylspiro[4.5]decane-2,4dione, mip. 2l2-2 13C. 1,3,8-triaza-8-(2-benzoyloxyethylj-7,7,9,9 I

tetrarnethyl-spiro 4'. 5 decane-2,4-'dion'e, 215217C.

EXAMPLE 3 8-Acryloyll ,3,8-triaza-7 ,7,9,9rtetramethyl-spiro[4.5 decane-2,4-dione To a suspension of 3 g. of sodium carbonate and 5 g. of l ,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5 ]decane- 2,4-dione in 40 m1. of dimethylformamide was added a solution of 3 g. of acryloyl chloride in 10 ml. of dimethylformamide at room temperature. After completion of the addition, the resulting mixture was stirred at room temperature for 30 minutes and subsequently at 6070C. for additional 4 hours.

Then, there'act'io'n mixture was concentrated and to the crystalline residue was added a dilute aqueous solution of acetic acid. The mixture was filtered to recover an insoluble crystalline substance,.which was washed with water, dried and recrystallized from dioxane to give the desired product as white crystals melting at 346347C. v

Analysis for C, H N O Calculated: C,60.19%; H,7.58%; N,15.04%. Found: C,6O.35%; H,7.60%; N,l5.20%.

IR spectrum (Nujol mull): 11 3320; 3170 cm, v 1770; 1735; 1630 cm, 11 1610 cm".

Substantially following the same procedure as set forth above, those compounds indicated below were prepared. v v

spiro[4.5]dec ane-2,4-dione,' 51 533 1 3 32 c.

- .1 ,3,8-triaza-7,7,9,QJetrainethyl-8-nitroso (with decomposition) EXAMPLE 4 l ,3 ,8-Triaza-8-( 2-cyanoethyl )-7,7,9,9 -tetramethylspiro[4. ]decane-2,4-dione EXAMPLE 5 1 ,3,8-Triaza-8-(2-cyanoethyl )-7,7,9,9-tetramethylspiro[4.5 ]decane-2,4-dithione The same procedure as set forth in the above Example 4 was repeated except that 2.6 g. of 1,3,8-triaza- 7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dithione and l g. of acrylonitrile were employed and recrystallization of the crystalline residue was made from benzene, thereby yielding the desired'product as white crystals melting at l80l8lC.

Analysis for C H N S -Calculated: C.54.l87r; H,7.l5%; N,18.05%; 8,2062%. Found: C,54.35%; l-l,7.ll%; N,18.00%;S,20.77%.

IR spectrum (Nujol mull): 11 3310; 3110 cm, 2220 cm".

EXAMPLE 6 l,3,8-Triaza-7,7,8,9,9-pentamethyl-spiro[4.5 ]decane- 2,4-dione To 22.5 g. of l,3,8-triaza-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione was added 256 g. of 90 formic acid and then 162 g. of 37 aqueous formaldehyde was added dropwise thereto over 1 hour at 2030C. After completion of the dropwise-addition, the resulting mixture was refluxed by gradual heating with stirring for about 7 hours until evolution of gaseous carbon dioxide ceased.

After completion of the reaction, the reaction mixture was cooled, diluted with 800 ml. of water and neutralized to pH 9-9.5 with 45 aqueous sodium hydroxide. The crystalline mass thus separated was recovered by filtration, washed with water, dried and recrystallized from isopropanol to give the desired product as white crystals melting at 200-203C.

Analysis for C H N O Calculated: C,59.23%; H,8.70%; N,17.29%. Found: C,59.43%; H,8.76%; N.l7.26%.

EXAMPLE 7 l ,3,8-Triaza-7,7,8,9,9-pentamethyl-spiro[ 4.5 ]decane- 2,4-dithione To 2.6 g. of l,3,8-triaza-7,7,9,9tetramethylspiro[4.5]decane-2,4-dithione was added 4 ml. of 30% aqueous formaldehyde, 0.6 ml. of formic acid was added thereto at 5060C. and further 0.5 ml. of 90% formic acid was added at 7080C. The resulting mixture was stirred at the latter temperature for 4 hours.

After cooling, an 30% aqueous solution of potassium hydroxide was added to the reaction mixture and the crystalline mass thus separated was recovered by filtration, washed with water, dried and then recrystallized from benzene to give the desired product as white crystals melting at l35-l36C.

Analysis for C H N S Calculated: C,53. l 2%; H,7.80%; N,15.49%; 5,2359%. Found: C,53.05%; H,7.77%; N,15.48%; S,23.7l%.

lR spectru m (Nujol mull): v 3300; 3100 cm'.

EXAMPLE 8 Mixtures were made from parts of polypropylene (Noblen JHH-G, available from Mitsui Toatsu Chemicals lnc., Japan, employed after two recrystallizations from monochlor'obenzene) and 0.25 part of each in turn of the stabilizing compounds of the invention indicated in Table l. The resulting mixtures were blended and melted, and the molten mixtures were moulded under heating and pressure into sheets 0.5 mm. thick. A control sheet, containing no stabilizer,

was also made.

The sheets were exposed to ultraviolet irradiation at 45C. in the Standard Fade-Meter Type FA-l manufactured and sold by Toyo Rika Instruments, lnc.,

Japan (a modification of the Atlas Fade-O-meter" Type FDA-R which meets the requirements prescribed in paragraph 3.8 of Japanese Industrial Standard L- 1044). The time taken for each sheet to become brittle is shown in Table l.

EXAMPLE 9 Mixtures were made from 100 parts of high-density polyethylene (Hi-Zex, available from Mitsui Toatsu Chemicals, lnc., Japan, employed after two recrystallizations from toluene) and 0.25 part of each in turn of the stabilizing compounds of the invention indicated in Table l. The resulting mixtures were made into sheets, in the same way as in Example 8; and a control sheet was also made, containing no stabilizer.

The brittleness time of each sheet was measured by the same test method as in Example 8.

The results are giveninTable I.

Table I.-Continued Stabilizing Brittleness time (hours) indicated in Table III, the resulting mixture was Compound kneaded'on akneading roll at 160C for 6 minute d Pl l H'hd 1 h-l San l2 :Tg i lg l z em 5 then molded'l'nto a sheet wlth a thickness of about 0.5 '3 720 mm. A control sheet, containing no stabilizer, was also 14 580 940 made. None 60 400 The sheet thus formed was aged under the following '0 aglng condition and retentlons of elongatlon and of tensile strength as well as coloration degree were determined by a conventional method. EXAMPLE l0 Aging test Mixtures were made from 100 parts of polystyrene I [Styron', trade name, employed after recrystalli- 15 1. Exposure .for 50 hours to the Sunshine Weather zation from a mixture of benzene with methanol, avail- Meter prescribed in Japanese Industrial Standard J IS able from Asahi-Dow Limited, Japan] and 0,25 part of Z-0230 entitled Accelerated Weathering Test Of each in turn of the stabilizing compounds of this inven- Rust Proofing Oils, Paragraph 2. tion as indicated in Table II. The resulting mixtures g ng a 190C. for 30 minutes in aGeers aging teswere molded at 180C. under pressure into a plate with Prescribed in J p nese dustrial Standard JIS K- a thickness of l mm. A control sheet, containing no sta 6301 emltled Physical Testing Methods for Vulcabilizer, was also made nlzed Rubber, Paragraph 6.5.

The plate thus formed wassubjected to the exposure The results are g ven n th following Table III. of ultraviolet ray irradiation in the Fade Meter as speci- Table [I]. tied in the above Example 8 at 45C. for 500 hours. A test piece of the treated plate was tested for color dif- Swbmzing weather Meter Geer's aging ference by means of a color-difference colorimeter acg d t nt f et nti n of tester o. cordlng to the method prescribed in Japanese. Induselongation tensile Strength Discolomion trlal Standard K-7l03, and a change of the yellow- 76 d' to the e ness index of the plate was calculated accor mg 7 l 66 75 Muddy yellow followmg q l 3 7l 79 Pale yellow 5 69 77 Pale yellow AYI Yl Yl 8 73 8O Pale yellow v None 53 69 Brown wherein AYI means achange of yellowness index, YI means a yellowness index after exposure and Yl means s an initial yellowness index of a test piece.

The results are summarized in the following Table ll. EXAMPLE 12 Mixtures were made from 100 parts of nylon-6 (CM Table I]. I01 1, available from Toray Industries Inc., Japan) and 0.25 part of each in turn of the stabilizing comswbmzing compound NO. Yl" A W pounds of the mventlon lndlcated in Table IV. The resultlng mlxtures were melted and moulded under pres- .3 sure into films 0.1 mm. thick, by means of a conven- 3:2 tional compression-moulding machine. A control film, 4 4.3 +4.5 containing no stabilizer, was also made. 2 j- 12-2 The films thus formed were aged under the aging 7 condition as shown below and-subjected to a tensile test 8 -5 to determine their retentions of elongation and of teng I 3 sile strength by a conventional method.

4.8 +l6.8 None Aging condltlons 1. Exposure for 200 hours to ultraviolet irradiation at 45C. in the Fade-Meter. EXAMPLE 1 l I 2. Agmg at lC. for 2 hours ln the Geers aglng tes- Mixtures were made from 100 parts of ABS resln ten (Kane Ace B-l2, trade name, available from Th results are Shown i Table IV,

Table IV.

Stabilizing Fade-Meter Geer's aging tester combpound Retention of Retention of Retention of Retention elongation(%) tensile elongation(%) of tensile strength( strength( l 68 81 72 3 72 77 72 69 5 66 71 67 68 8 63 73 74 73 None 16 49 23 51 Kane gafuchi Spinning Co., Ltd.] and 0.5 part of each in turn of the stabilizing compounds of this invention as EXAMPLE l3 Mixtures were made from 100 parts of polyurethane prepared from polycaprolactone (E-5080," available from The Nippon Elastollan Industries Ltd., Japan) and 0.5 part of each in turn of the stabilizing compounds of the invention indicated in Table V. The resulting mixture were melted and moulded into sheets about 0.5 mm. thick. A control sheet, containing no stabilizer, was also made.

The sheets thus formed were exposed to ultraviolet irradiation for 15 hours at 45C. in the Fade Meter described in Example 8 and their retention of elongation and tensile strength were then measured. The results are given in Table V.

Mixtures were made from 100 parts of polyvinyl chloride (Geon 103 EP,? available from The Japanese Geon Co., Ltd., Japan), 40 parts of dioctyl phthalate and 0.2 part of each in turn of the stabilizing compounds of the invention indicated in Table VI. The resulting mixture were kneaded for minutes on kneading rolls at 140C., and formed into sheets about 1 mm. thick. A control sheet, containing none of the stabilizers of the invention, was also made.

The sheets thus formed were aged under the conditions described below, and the degree of discoloration was noted.

tester. The results are shown in Table VI.

Table VI.

Stabilizing compound Weather Meter Geers aging tester l Yellowish brown Pale brown 3 Pale brown Pale brown 5 Light brown-brown Pale brown None Dark brown Reddish brown EXAMPLE Mixtures were made from 100 parts of polyester resin [Ester-G 1 3, trade name, available from Mitsui Toatsu Chemicals, lnc., Japan], I part of benzoyl peroxide and 0.2 part of each in turn of the stabilizing compounds as indicated in Table VII. The resulting mixture was cured by pre-heating at 60C. for minutes and then heating at 100C. for additional 1 hour to formed into a plate with a thickness of 3 mm. A control plate, containing no stabilizer, was also made. The plate thus formed was exposed to irradiation in the Sunshine Weather Meter as described in the above Example I l for 60 hours and the change of yellowness index thereof was determined according to the method described in the above Example 10.

The results are given in the following Table VII.

Table VII.

Stabilizing compound N0. YI A YI l 2.4 7.3 3 2.2 8.9 5 2.3 9.0 None 1.8 13.9

EXAMPLE l6 Table VIII.

Rate of reduction reduction in decomposition ('71) Stabilizing compound No.

I 0.53 3 0.58 S 0.47 None 0.80

It will be apparent from the above Tables I to VIII that the piperidine-spiro-hydantoin derivatives (1) of this invention have an excellent stabilizing effect on various synthetic polymers.

What is claimed is:

l. A synthetic polymer composition stabilized against photoand thermal-deterioration wherein there is incorporated, in a sufficient amount to prevent said deterioration, at least one compound having the formula X HII-f I I... Y I

3 CH3 CH N ca wherein R is an alkyl group of l to 8 carbon atoms, an alkenyl group of 3 to 4 carbon atoms, an alkenoyl group of 3 to 4 carbon atoms, an alkoxyalkyl group of l to 8 carbon atoms in each of the alkoxy and alkyl moieties, an alkoxycarbonyalkyl group of l to 4 carbon atoms in the alkyl moiety and of l to 18 carbon atoms in the alkoxy moiety, an acyloxyalkyl group of l to 4 carbon atoms in the alkyl moiety and of an unsaturated or saturated aliphatic or aromatic acyl moiety and a cyanoalkyl group of l to 4 car bon atoms and X and Y each represent oxygen atom.

2. The synthetic polymer composition according to claim 1 wherein saidcompound' (l) is incorporated in an amount of 0.0l-5.0% by weight, based upon the amount of the synthetic polymer.

3. The synthetic polymer composition according to claim 1 wherein said polymer is a polyolefin.

4. The synthetic polymer composition according to claim 1 wherein said polymer is a polyvinyl chloride.

5. The synthetic polymer composition according to claim 1 wherein said polymer is a polyurethane.

6. The synthetic polymer composition according to claim 1 wherein said polymer is a polyester.

7. The synthetic polymer composition according to claim 1 wherein said polymer is a polyacetal.

8.The synthetic polymer composition according to claim 1 wherein said polymer is an acrylonitrilestyrene-butadiene copolymer.

9. The synthetic polymer composition according to claim 1 wherein said compound (I) is selected from the group consisting of I ,3 ,8-triaza-7,7,8,9,9-pentamethyl-spiro[4.5 ]decane-2,4-dione,

l ,3 ,8-triaza-7 ,7,9 ,9-tetramethyl-8-octyl-spiro 4.5

decane-2,4-dione,

l ,3 ,8-triaza-8-( 2-ethoxyethyl )-7 ,7 ,9,9-tetramethyl- Spiro-[4.5 ]decane-2,4-dione,

'8-acryloyll ,3,8-triaza-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione,

8-allyl-l ,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5

decane-2,4-dione,

8 2-acetoxyethyl l ,3 ,8-triaza-7 ,7,9,9-tetramethylspiro-[ 4.5 ]decane-2,4-dione,

1 ,3 ,8-triaza-8-( 2-cyanoethyl )-7,7,9,9-tetramethylspiro[4.5 ]-decane-2,4-dione and l ,3,8-triaza-8-ethoxycarbonylmethyl-7,7,9,9-

tetramethy1-spiro[4.5 ]decane-2,4-dione. 

1. A SYNTHETIC POLYMER COMPOSITION STABILIZED AGAINST PHOTO- AND THERMAL-DETERIOTATION WHEREIN THERE IS INCORPORATED, IN A SUFFICIENT AMOUNT TO PREVENT SAID DETERIORATION, AT LEAST ONE COMPOUND HAVING THE FORMULA
 2. The synthetic polymer composition according to claim 1 wherein said compound (I) is incorporated in an amount of 0.01-5.0% by weight, based upon the amount of the synthetic polymer.
 3. The synthetic polymer composition according to claim 1 wherein said polymer is a polyolefin.
 4. The synthetic polymer composition according to claim 1 wherein said polymer is a polyvinyl chloride.
 5. The synthetic polymer composition according to claim 1 wherein said polymer is a polyurethane.
 6. The synthetic polymer composition according to claim 1 wherein said polymer is a polyester.
 7. The synthetic polymer composition according to claim 1 wherein said polymer is a polyacetal.
 8. The synthetic polymer composition according to claim 1 wherein said polymer is an acrylonitrile-styrene-butadiene copolymer.
 9. The synthetic polymer composition according to claim 1 wherein said compound (I) is selected from the group consisting of 1,3,8-triaza-7,7,8,9,9-pentamethyl-spiro(4.5)decane-2,4-dione, 1,3,8-triaza-7,7,9,9-tetramethyl-8-octyl-spiro(4.5)decane-2,4-dione, 1,3,8-triaza-8-(2-ethoxyethyl)-7,7,9,9-tetramethyl-spiro-(4.5)decane-2,4 -dione, 8-acryloyl-1,3,8-triaza-7,7,9,9-tetramethyl-spiro(4.5)decane-2, 4-dione, 8-allyl-1,3,8-triaza-7,7,9,9-tetramethyl-spiro(4.5)decane-2,4-dione, 8(2-acetoxyethyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro-(4.5)decane-2,4 -dione, 1,3,8-triaza-8-(2-cyanoethyl)-7,7,9,9-tetramethyl-spiro(4.5)-decane-2,4 -dione and 1,3,8-triaza-8-ethoxycarbonylmethyl-7,7,9,9-tetramethyl-spiro(4.5)decane-2,4-dione. 